• erosion (movement of sediment via gravity, wind, water)

• deposition (laying down sediment by wind, water, ice)

• weathering (wearing down of rocks)

• earth motion​ (plate movement, earthquake, volcanoes, etc)

​geologic processes

a prinicple that state the geologic processes that occur today are similar to those that have occurred in the past

• this means we can student the present to learn about the past​

uniformitarianism

What is the basis for understanding Earth's past?

• the age of rocks and geologic features compared with other rocks and geologic features

• there are 5 principles (rules) to determine relative age​

​​absolute age

​

• the actual age of events; exact numbers or a range of numbers

• sometimes scientists use radioactive dating to determine​ actual age

relative-age

​

​Example

• Ms. Chua is older than me (student) but is younger than Ms. Perez

​Example

• I am ___

• Ms. Chua is 33

• Ms. Perez is 34